Sash-fastener



(ModeL) 2 Sheets-Sheet 1. T. SMITH.

SASH FASTENER. No. 398,549. Patented Feb. 26, 1889.

N PUER5 Plwwmm m mr, Washingiml. oc.

2 Sheets-Sheet 2.

'(ModeL) T. S. SMITH.

sASH FASTENER.

No. 398,549. Patented Feb. 26, 1889.

Unirnn terns PATENT OFFICE.

THOMAS S. SMITH, OF \VASIIINGTON, DISTRICT OF COLUMBIA, 1:.XSSIGNOR TO HOBART B. IVES AND COMPANY, OF YIUY HAVEN, CONNECTICUT.

SASH-FASTEN ER.

SPECIFICATION forming part of Letters Patent No. 398,549, dated February 26, 1889. Application filed February 3, 1888. Serial No. 262,889. (Modeld .To aZZ whom it may concern: invention, and I do not therefore limit my- Be it known that l, Tnonas S. SMITH, of 3 self to any particular form thereof. \Vashingtomin the District of Columliia, have Upon the upper face of the base A slides invented certain new and useful Improveand swings the latch B,consisting of the main 5 5 5 ments in Saslrl asteners; and Ido hereby depivotal portion resting on the base and the clare that the following is a full, clear, and hook B extending out therefrom for engageexact description thereof, reference being had ment with the keeper or stud C in the usual to the accompanyingdrawings, in which- 7 and well-known way Such keeper is pref- Figure 1 shows a perspective view of my erahly, as shown, of a hooked formthat is, 60 1o fastener with the parts in position as when having a sidewise-extendinglug or arm, C,in the latch is locked open; Figl 2, a plan view position to engage the upper side of the of the same with the portion. of the knob or 5 shank of the latch-hook 1-3 when said hook h turning-handle to which the operating-cam is is in engagement with the keeper, and so hold attached removed; Fig. 3, a similar view the latch-hook down. 65 showing the cam turned to cam the latch'lon- In the main or pivotal portion of the latch gitudinally, so as to unlock it preparatory to is the usual longitudinal slot, 13*, cut down swinging it around into fastening position; through the latch, and in the upper side of Fig. at, a similar view showing the cam turned such latch portion is the recess or depression to swing the latch into position to engage the .5 As shown, this recess is rectangular in keeper; Fig. 5, a similar view showing the general shape, with the corners of the rectanlatch cammed inward to draw the sashes togle rounded; butl do not limit myself to such gether and lock them securely; Fig. 6, a like shape or configuration. view showing the cam and latch in the dif- On the under side of the latch B are shown ferent positions taken by them as the latch is two guide lugs or studs, 1) 12, substantially in 7 5 unlocked and swung back toward its front line with and at opposite ends of the slot 13 position; Fig. 7, a detail perspective view of The two lugs or studs are not, however, both the base with the latch removed, but with the necessary to the proper action of my fastener. lugs or pins on the latch shown in the posi- One or the other may be dispensed with withtions taken by them when the latch in its out departure from my invention, and with- 80 open and closed positions; Fig. 8, a like view out changing the operation of the parts of the showing the lower side of the latch, and Fig. fastener. For the engagement of each guide- 9 a view of a vertical section of the fastener lug used there is in the base a curved slot, A

on line cc :0 of Fig. 2. concentric with the piwot-pin hole A. The

Letters of like name and kind refer to like one of these slots which engages the forward 85 parts in each of the figures. or outer lug 1) extends from a point at one The object of my invention is to provide an side of the pivotal opening A around through improved sash-fastener; and to this end my a quart-er of a circle to a point directly in invention consists in the fastener and in the front of such opening, while the other guideconstruction, arrangement, and combination slot extends from a point diametricallyoppo- 9o of the parts thereof, as hereinafter specified. site the rear end of the first slot around rear- In the drawings, A designates the baseward to apoint diametrically oppositethe forplate upon which the latch and operative ward end of the same. At the forward end of parts of the fastener are supported. This the slot A which engages the forward lug b base-plate is to be fastened in place on the on the latch a notch or offset, (1, extends 9 5 sash, or where desired, by anysuitable means. radially inward, while at the rear end of the As shown, it is like the base or bottom plates other slot A a similar notch, a, or offset exof the fasteners now in the market, provided tends radially outward in line with the pivk with holes for attaching screws on opposite otal opening A in the base and the notch or sides of its central portion. The method or offset from the forward end of the other notch. too means of attaching the fastener base plate At the rear end. of the slot engaging the fordoes not, however, constitute any part of my ward latch-lug b is shown an outwardlyex- "Where only one lug b on the latch is used,-

the guiding-slot for the other lug, together with its end offsets, can be dispensed with.

Extending down from the operating knob 1 or handle D is the pivot-pin .E, passing through the slot B in latch B and the pivotal openire A in the base. At its lower end this pin cl .1 be headed or'otherwise fixed against disengagement from the pivotal opening. Said pin can be rigidly attached to or made in one piece with the knob, or the latter can be pivoted upon it, so as to turn aroundit.

The knob or handle D is on its under side provided with the cam F, situated within the recess 13 in the latch. Such cam is preferably of the triangular form shown, with the pivot pin or axis of rotation of the knob passing through it near one apex of the triangle, and the side of the cam opposite to such apex 2 5 substantially concentric to the axis of rotation of the knob. Both the corners and sides of the cam are preferably rounded; but such rounding is not necessary.

The operation of my fastener is as follows: lVith the latch open and the parts in the po sition as shown in Fig. 2, the forward and rear guiding-lugs Z) I) on the latch occupy the lock ing-offsets an at the rear and forward ends, respectively, of their respective guiding-slots 3 5 A and A The latch cannot then be swung forward toward its fastening position until it has first been moved longitudinally inward to disengage the lugs E Z) from their lockingnotches' in the base. The cam F, engaging the end or side of the recess B toward the hook end of the latch with a ortion of its outer side, as shown, holds the latch positively against such longitudinal inward movement; The latch cannot then be accidentally moved inward, so as to leave it in unlocked position, until the knob D has been turned to rotate the cam F from the position shown in Fig. 2 to that shown in Fig. 3. Until the knob and cam have been so turned thelatch will be then positivelylocked open, and cannot in anyway be accidentally swung into position to injure the bars of the upper sash as the lower sash is moved up or down. As will be observed in Fig. 2, the portion of the outer side of the cam in contact with the recess wall or side is substantially in line with the center of rotation of the cam, so that the pressure by such wall upon the cam-such as would take place if it should be attempted to force the latch inward-cannot have any tendency to rotate the cam, Upon turning the knob D to swing the cam F toward the pcsition occupied by it in Fig. 3, said cam first passes outof engagement with the outer or front side of the recess 13*, and, engaging the opposite rear or inner recess side with an eccentric portion of its face, cams the latch longitudinally inward to clear the gu ide-lu gs I) b thereon from their notches a a in the base. Continued swinging of the cam F, as the latch can no longer move longitudinally on account of the engagement of the guide-lugs Z) I) on the latch with the concentric curved slots A A in the base, will then cause the latch to swing around the pivot-pin E as a center until it arrives at the position shown in Fig. 4. During this swinging the cam has continued to have its eccentric side or portion in contact with the rear recess side. Upon arriving at the position shown in Fig. 4:, so as to engage the keeper 0, the latch is prevented from further swinging by the engagement of its guidelugs with the ends of the guide-slots A A in the base. Said guide-lugs are now opposite the offset-s a a, extending radially from such ends of the slots, and the cam, engaging the rear or inner wall of the latch recess B cams the latch longitudinally inward, which I movement of the latch brings the lugs or studs b 1) into full engagement with the said look ing notches or offsets from the curved guidin g-slots A A brings a portion of the outer side or face of the cam around into contactwith the rear side of the recess B as shown in Fig. 5, so as to hold the latch positively in its inward or rearward position. The. line of pressure of the recess wall upon the outer cam-face is substantially in line with the pivotal center of the cam, so that such pressure can have no tendencyio turn the cam. Upon turning the knob in the other direction to unfasten the sashes, the cam first disengages itself from the outer rear recess side, and then engages the former side of the recess, so as to cam the latch longitudinally outward to clear its lugs or studs 1) b from locking-notches a a. The lugs and notches being disengaged and the latch prevented from further outward move- 'ment by the engagement of the lugs with the sides of the curved guide-slots A A further movement of the cam causes the latch to swing back until the lugs or studs b I) thereon come in contact with the ends of the slots A A and in line with the notches or offsets a a for locking the latch open. Continued rotation of the cam then causes the latch to be cannned outward, so as to carry the latch-lugs into such offsets, and brings a portion of the outer face or side of the cam around into contact with the outer or forward recess side to hold the latch positively outward, as in the position of the parts first described.

\Vhile I prefer to have the lugs I) 1), as shown, substantially in line with the longitudinal slot B in the latch, I do not limit myself to such particular location of them. They can be changed somewhat in position, the slots A 18 and the locking-notches a a and a a being correspondingly changed, so that each notch shall be properly situated for receiving and engaging its lug when the latch is moved longitudinally.

\Vhile I prefer to have the cam F shaped The rotation of the cam now substantially as described, with its outer side concentric with its center or axis of rotation, I do notlimit myself to such shape. Itis sufficient if at or near the ends of the outer side of the cam there are faces adapted to squarely and positively engage the front and rear walls of the latch-recess B, so as to hold the latch positively outward or inward, as described hereinbefore. As the end portions only of the outer side or face of the cam are then necessary for this engagement of the recess-walls, the central portion of such face or side can, if desired, be removed or cut away, as indicated in dotted lines in Fig. 5, without interfering with the operation of my fastener or departure from my invention.

As indicated h ereinbefore, either one of the guide-lugs b on the latch and the correspond.- ing guidin slot in the base, with its respective notches or offsets a and a, can be dispensed with.

My fastener, as shown and described, is simple, strong, and easy and efficient in action. It draws the sashes closely together, holds them fastened, while preventing their rattling, and is locked securely both in its open and shut positions. In neither of these positions can the guide lug or lugs on the latch become disengaged from the locking notch or notches on the base by accident, or until the operating-knob is turned. Obviously the arrangement of the guide lug or lugs and the guiding slot or slots can be reversed without departure from 1nyinvention that is, the guide lug or lugs can be attached to the base and the engaging guideways or slots can be made in the latch. As such a change would be a mere reversal of the parts, not involving any patentable invention, I consider the resulting construction entirely within the scope of my invention, as described and claimed in the present application.

Having thus described my invention, what I I canrreoess, the pivot-pin, and the cam having claim is- 1. In a sash-fastener, in combination with the latch provided with the ca1n-engaging rei portions on its outer side to engagetherecesscess, the cam adapted to engage the outer side of the recess to force the latch outward and 1 have acted upon them, substai'itially as and provided wit h an abutting portion to be swung around behind such side of the recess, so as to hold the latch positively outward, substantially as and for the purpose shown.

2. In a sash-fastener, in combination with the latch having the longitudinalslot and the cam-engaging recess, the pivot-pin. engaging the slot, and the rotary cam adapt-ed to engage the recess-side, so as to force the latch outward, and having an abutting face on its outer side adapted to be brought by the rotation of the cam around behind the recess"- side, so as to lock thelatch positively outward, substantially as and for the purpose set forth.

3. In a sash-fastener, in combination with the latch having the cam-engaging recess, the base, and engaging, guiding, and locking devices on the base and latch, respectively, to guide the latch in its swing and lock it from swinging as it is moved longitudinally at the ends of its swing, and the rotary cam having portions to engage the latch recess sides to swing the latch and move it longitudinally, and with abutting faces on its outer side adapted to be moved around behind the engaged recess-sides when the latch has been moved longitudinally, so as to lock the latch positively against return movement, substantially as and for the purpose described.

t. In a sash-fastener, in combination with the base provided wit-h acurved guiding-surface having an inwardly-extending offset or notch at one end and a radial shoulder at the other, the latch having the longitudinal slot, the canrrecess, and the guide-lug, the pivotpin engaging the slot in the latch, and the cam having the surfaces adapted to engage the recess-sides, so as to swing the latch and move it longitudinally at each end of its swing, and the abutting faces on its outer side adapted to swing around behind the recesssides when the latch has been moved longitudinally, so as to positively lock the latch as moved, substantially as and for the purpose specified.

5. In combination with the swinging and longitudinally-moving latch provided with the ea1n-recess,t-l1e cam having the two eccentric sides for engaging opposite sides of the recess as the cam is swung in one direction or the other,and substantially concentric faces on its outer side for engagement with the recesssidcs when the latch has been moved longitudinally, substantially as and for the purpose shown.

6. In combination with the base having a curved guiding surface and an inwardly-ey tending notch at one end of such surface and a shoulder at the other end, the latch having the guide-lug, the longitudinal slot, and the eccentric portions to engage opposite sides of the cam'recess and substantially concentric sides after the eccentric portions of the cam for the purpose set forth.

7. In a sashfastener, in con'lbination with the base having the two concentric slots with oppositelycxtending locking-notches at their opposite ends, the latch having the two guidelugs and the cam-recess, and the triangular cam having the two eccentric sides and the concentric outer end or side, substantially as and for the purpose shown.

In testimony that I claim the foregoing I have hereunto set my hand this 3d day of Felt ruary, 1988.

THOMAS S. SMITH.

Witnesses:

WILLIAM FITCH, GEORGE E. Ten

IIO 

